Cosworth Paulinho Ferreira Senior Moderator Location: Charlotte, NC Join Date: 03/15/2007 Age: Midlife Crisis Posts: 721 Rally Car: Honda Civic |
Yes those are probably the best calipers in the US rally scene right now. Its the same shit I have, and Derik Nelson in his M3. As for the Clio R3T setup, guess who came up with that setup??? Yes its the same calipers front and rear that I installed in my Civic 3 years ago. The fronts are ZR34 which as said before are a late model roundy round caliper, and the rears are Formula 2000 calipers. The same setup I pushed into Ireland, Spain, France and Italy when I worked in Banbury. But even though those calipers are better than the APs in the fact that they're forged monoblocks and have a few other built in features. The biggest problem is you're stuck with 1 or 2 flavors of pad choice. And because its PFC you're stuck with possibly never being able to get spare parts. I would recommend the AP calipers and they're a little cheaper, all pad manufacturers make that pad shape and the pads are super cheap. Edited 1 time(s). Last edit at 05/12/2014 10:25PM by Cosworth. |
sidewaez Blake Lind Junior Moderator Location: Hillsboro Oregon Join Date: 06/09/2009 Age: Midlife Crisis Posts: 233 Rally Car: orange AE86 |
I thought that's what was on Deriks's car. Which AP Calipers? What size pistons front and rear? You said the pedal on your SP STi with GrpN brakes was crazy stiff what do you attribute that too, what m/c size is it? Thanks! |
Cosworth Paulinho Ferreira Senior Moderator Location: Charlotte, NC Join Date: 03/15/2007 Age: Midlife Crisis Posts: 721 Rally Car: Honda Civic |
The AP caliper I was recommending is the one everyone is using now the AP Racing CP8350. As for sizes I think there's only 2 sizes available, a "front" and a "rear" so not much fussing about that. Just setup the brake bias with m/c selection. As for the GrN setup, it uses the OEM STI master cylinder, and no brake booster, so its horrible hydraulic ratio. The AP calipers have smaller pistons than the original Brembo calipers. To give you an idea just go drive a street STI without the brake booster connected and you'll see. There's a few tricks GrN teams do to make things better like redrilling the clevis point closer to the fulcrum. |
john vanlandingham John Vanlandingham Professional Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
about the 8th-9th time this same thing has played out...somebody axs, I say "meh ---cars about that size use either 4 times blah blah or 2 times 1.5 two times blah blah" , I get chided, corrected , lectured, and then the recommended caliper has MIRACULOUSLY, the exact size I said quite literally decades fawkin decades ago... I try not to wonder WTF too much when people go to the trouble of correcting me and then after a few days end up recommending the exact thing down to the mm. That's why I say its a fuckin miracle! John Vanlandingham Sleezattle, WA, USA Vive le Prole-le-ralliat www.rallyrace.net/jvab CALL +1 206 431-9696 Remember! Pacific Standard Time is 3 hours behind Eastern Standard Time. |
Cosworth Paulinho Ferreira Senior Moderator Location: Charlotte, NC Join Date: 03/15/2007 Age: Midlife Crisis Posts: 721 Rally Car: Honda Civic |
People correct you when you make silly statements that NASCAR sized caliper pistons are no good because "too touchy" and because some wankers in england like to use different sizes since way back when black jesus was born. When in fact piston sizes are just a small fraction of the equation. Thats the fuckin miracle ese. You dont need to rely just on caliper piston sizes. And have you thought for a secong that the reason it has the same size is because its the same fuckin brand (AP) comprende amigo? |
sidewaez Blake Lind Junior Moderator Location: Hillsboro Oregon Join Date: 06/09/2009 Age: Midlife Crisis Posts: 233 Rally Car: orange AE86 |
Now that you make me think about it, in SP I'm free to change the master cylinder and I actually have a grn booster delete sitting on my desk but that makes me retain Subaru's weird bolt pattern master, how about something like this:
http://www.chasebays.com/product/subaru-wrxsti/chase-bays-brake-booster-eliminator And then run a good proportioning valve to get the bias correct? |
Cosworth Paulinho Ferreira Senior Moderator Location: Charlotte, NC Join Date: 03/15/2007 Age: Midlife Crisis Posts: 721 Rally Car: Honda Civic |
NO. That thing only uses one, single piston master cylinder. You need to have a tandem master cylinder. Its a cylinder with 2 pistons inside. One piston for 4 wheels makes things behave radical and god forbid you break a line. Also with a system like that your rear brakes will "bite" before the fronts.
Try and find an OEM suby master that is smaller diameter and call it a day. I have the same GrN booster delete in mine. |
john vanlandingham John Vanlandingham Professional Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
Paul what the fuck-- I know, you know, we know I knew, you knew, we knew that there are a number of factors. That's like saying the sky is blue today, the sky was blue 20 years ago. And no I never thought it was the same brand---because I've seen AP Racing, Alcon, Brembo, Sumitomo all clustered around the same sizes for cars weighing whatever and doing the speeds we do on gravel... of course there's a whole slew of factors but I keep saying we would be foolish to ignore this information---especially when you keep recommending calipers that are in fact the size I've been telling people since the late 1980s... And it's not because "some wankers in England" used anything one way or the other.. It's because we see this 1.5 + 1.625 front on all kinds of this from Audis in GpB days (Germen wankers?) to Volvos (Swedish wankers) to Opels (more Swedish wankers running the stuff---must have convinced the German wankers) to VWs--(damn, more Swede wankers fooling the gullible German wankers) to Subies (well we know there were a lot of British wankers involved with that---) to Misterbitchis (more English wankers) So yeah maybe all the English works teams and all the Swedes works teams and all the Allemani werks teams are all wankers*....but those wankers all had enough budgets --just a weeeee bit more than clubbies here----to try out whatever they wanted for calipers with whatever sizes of pistons they wanted.. Somehow the sizes they all ended up with---for cars this size and weight on gravel surface---ended up pretty much the same... Kinda like they could do any gearsets they wanted to homologate---and especially the overall box x final came out awfully damn similar---even once the FWD boxes went from stuff like old VW 5.08 final drive to the 4.2 (just to have bigger and stronger pinion) when you look at the 4th and 5th being under-driven, the overall 1 thru 5 remains more or less the same as other 2.0 cars FWD OR RWD Kinda like valve sizes, cam profiles, pedal ratios, track width, overhang, a whole raft of things.... For a given size and weight car with a given size engine, a whole lot of things end up pretty much the same---if they are going to work well. Basically what you and often Gene McC are saying is "There is no point to look at any details of what has ever worked and no point in doing comparisons, no point at all in trying to learn anything, no point in trying to see patterns, no point in trying to learn." Pretty odd point of view if'n you ask me...
I think I do *cannot comment on the French and Italian cars and teams because that's not where I have been armed with my vernier calipers and notepad. But I cna guess they are not particularly different. John Vanlandingham Sleezattle, WA, USA Vive le Prole-le-ralliat www.rallyrace.net/jvab CALL +1 206 431-9696 Remember! Pacific Standard Time is 3 hours behind Eastern Standard Time. |
john vanlandingham John Vanlandingham Professional Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
OMG. Blake what are you thinking? That is bad. Look at those clowns contact info.1300 bumfuck Blvd Fucking Bummingham Alafuckingbammy https://maps.google.com/maps?oe=utf-8&client=firefox-a&channel=sb&ie=UTF-8&layer=c&z=17&iwloc=A&sll=33.498157,-86.857766&cbp=13,263.6,0,0,0&cbll=33.498161,-86.857732&q=1300+Monroe+Ave+SW+Birmingham,+AL+35211&ei=6lVyU-L-Bo_hoASbl4HoCg&ved=0CCsQxB0wAA Google Map and street view.... Hilarious what you find... John Vanlandingham Sleezattle, WA, USA Vive le Prole-le-ralliat www.rallyrace.net/jvab CALL +1 206 431-9696 Remember! Pacific Standard Time is 3 hours behind Eastern Standard Time. |
Cosworth Paulinho Ferreira Senior Moderator Location: Charlotte, NC Join Date: 03/15/2007 Age: Midlife Crisis Posts: 721 Rally Car: Honda Civic |
John, I dont think you got it when I said wankers in England. Arent AP's from englang? Werent GrB Audi's on AP's? What calipers do the germans or sweeds make? None! And as I said before that continuity of sizes are because of the packaging. There's only so much space for pistons in multi piston calipers, so the practical size is around 38 to 45mm. Bigger than that and the piston caps start to hit the bobbins (mounting hardware) of the disc to the bells. And smaller pistons require much more pressure and have a tendency to cause the pad backing plate to bend like a potato chip. These are the real reasons caliper pistons are sized like they are, not some prophecy that said, 1000kg car on garvel needs 38/41. Lets stop this discussion, because at this point its not doing any good for people reading. As for that Chasebays kit man, those guys started off doing wiring harnesses for engine swaps and wire tucks. Now they're in the brake business? Its like me and John opening a cup cake factory |
Andrew_Frick Andrew Frick Ultra Moderator Location: Greenville, SC Join Date: 05/18/2007 Age: Midlife Crisis Posts: 684 Rally Car: Rally Spec Ford Focus |
So looking at their kit it looks like it was designed by someone who was more interested in eliminating the unsightly brake booster / master cylinder than a racing component. Much closer to wire tuck / shaved bay. Than a racing part. |
sidewaez Blake Lind Junior Moderator Location: Hillsboro Oregon Join Date: 06/09/2009 Age: Midlife Crisis Posts: 233 Rally Car: orange AE86 |
Good info, this is why I'm asking questions here because honestly I didn't know, the smallest master from any 1990+ suabru is 15/16" in fact the previous generation STi had 1.0625" masters. What year STi is your's, what size is the master in it?
That's pretty funny! Edited 1 time(s). Last edit at 05/13/2014 09:00PM by sidewaez. |
Cosworth Paulinho Ferreira Senior Moderator Location: Charlotte, NC Join Date: 03/15/2007 Age: Midlife Crisis Posts: 721 Rally Car: Honda Civic |
06 and its OEM master 1-1/16". Car ran in GrN in the past so it has a bunch of OE parts that dont need to be for SP. So I'm thinking of finding a 7/8 master from a Forester from what I'm told. So an STI 1-1/16 master is 48% bigger in area than a 7/8's from the Forester: 572.6mm^2 vs 387mm^2. So as you guessed that equates to a potential 48% increase in brake torque (gotta account for line and caliper flex with extra pressure) Shirley with this modification and redrilling the clevis point it will make the brakes more like a race-cah. But based on my calcs, it will still be less tq output for the same pedal force. |
Do It Sidewayz Chris Martin Infallible Moderator Location: Toronto, Ontario Join Date: 01/15/2006 Age: Midlife Crisis Posts: 567 Rally Car: E-85 powered Impreza |
I'm using a Master cylinder from a Honda Civic, i THINK it's 13/16. I'm not running the booster (just replaced with a plate), but i believe it would have bolted up to the OEM booster as the bolt pattern was the same.
You will need to mess with the brake lines, but that's not a huge deal. It had 2 ports. Trying to remember now, and i'm feeling like sticking my head under the dash. But i did drill a new pivot point in the pedal, but believe after trying it i'm back to the OEM hole. Car brakes just fine with good pads, and pedal effort is "normal" Chris |
sidewaez Blake Lind Junior Moderator Location: Hillsboro Oregon Join Date: 06/09/2009 Age: Midlife Crisis Posts: 233 Rally Car: orange AE86 |
the 2008 and newer STi's have different bolt pattern for the master cylinder, but the booster bolt pattern is the same so I could just get a master delete for and earlier one, I looked through almost every year forester rockauto and couldn't find one with a master that was smaller than 15/16" anybody know what year it needs to be from?
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